Carburetor



June 21, 1966 B. WALKER 3,256,870

CARBURETOR Filed Dec. 18. 1964 4 Sheets-Sheet 1 f g f, w 32 June 21,1966 B. WALKER 3,256,870

CARBURETOR Filed Dec. 18, 1964 4 Sheets-Sheet 2 /2 K 60V. {WITCH 71020545 sw/rch' i v w l TH B. WALKER June 21, 1966 CARBURETOR 4 Sheets-Sheet5 Filed Dec. 18 1964 June 21, 1966 B. WALKER 3,256,870

GARBURETOR Filed Dec. 18 1964 4 Sheets-Sheet 4 CV I. M

United States Patent 3,256,870 CARBURETOR Brooks Walker, 1280 ColumbusAve., San Francisco, Calif. Filed Dec. 18, 1964, Ser. No. 419,418 26Claims. Cl. 12397) This application is a continuation-in-part of mycopending application Serial No. 166,592, filed January 16, 1962.

This invention pertains to an improvement in a carburetor control for avehicle that operates an appreciable time on decelerations when it isdesirable to eliminate any flow of fuel to the main or idle jets duringsuch closed throttle decelerations.

This invention involves the sucking out rapidly of al the fuel in thefloat chamber and the risers to the main and idle jets while at the sametime shutting off the fuel flow to the float bowl from the fuel tank inorder that no fuel will flow through the main or idle jets during thedeceleration above a predetermined engine or car speed.

Other inventors have put suction on the carburetor bowl such as shown inFIG. 30 of the SAE Report No. 170, Automotive Exhaust HydrocarbonReduction During Deceleration by Induction System Devices," dated August12-16, 1957. This involves boiling of the fuel in the bowl, slop overinto the jets, etc., as related in the report, page 14, paragraph 13 ofthe above identified report.

Another object of the invention is to lift the float when the fuel issucked out of the carburetor bowl so that no fuel can flow from the fueltank by gravity (from a gravity-type tank) or by pressure from the fuelpump to the float bowl during this shut off period.

Another object is to make use of the float bowl needle valve to closeoff the flow from the fuel pump and fuel tank and thereby eliminate thenecessity of introducing another valve and more fuel between the secondvalve and the float bowl which should be sucked out from the float bowlback to the shut off valve. This should simplify construction and reducecosts.

Another object of the invention is to provide a cylinder and piston tosuck the fuel out of the carburetor bowl and allow the fuel that leaksby the fuel piston to flow back to the bowl while providing acontinuation of the cylinder for fluid pressure, such as engine vacuumor suction from the engine intake manifold to operate a second piston inline with the first cylinder to power the fuel evacuating cylinder.

Another object is to provide a baflle for the fast return of the fuel tothe float chamber so that fuel will not hit the float chamber breatherhole which may bevented outside or to the intake to the carburetor.

Another object of the invention is to provide a diaphragm-type suck-outpump for the float bowl where engine intake manifold suction may be usedto power the diaphragm to suck out the fuel as high suction is generallyavailable when the fuel is to be sucked from the float bowl.

Rapid return of the fuel to the bowl to prevent engine stalling orreestablish power is desirable and available with this device withpassage from the suck out pump to the float chamber being much largerthan the fuel supply Patented June 21, 1966 mixture resulting from avery low fuel level in the float chamber existing during a portion ofthe suck out or fuel replacement cycle.

Another object of the invention is to locate the suck out pump below thecarburetor float bowl so that once the fuel is sucked out of the floatbowl and into the pump chamber there is no tendency for it to flow backto the bowl by gravity. On a very long deceleration, such as going downa mountain road, it may be desirable to 'have a dry float bowl for along period of time and a pump located above the bowl could conceivablyallow fuel to flow by gravity back into the bowl over a protractedperiod of time.

Other objects of the invention will be more particularly pointed out inthe accompanying specification and claims.

I have illustrated my invention by way of example in the accompanyingdrawings, in which:

FIG. 1 is side elevation partly cut away of a carburetor employing oneform of the invention;

FIG. 2 is side elevation partly cut away of a portion of the controlcircuit which could be used in FIG. 1;

FIG. 3 is a side elevation partly cut away showing a portion of acarburetor involving another form of the invention;

FIG. 4 is a side elevation of the same invention shown in FIG. 3 withthe fuel sucked out of the float bowl;

FIG. 5 is a modification of the invention disclosed in FIG. 1; and

FIG. 6 is a further modification of the invention.

In all figures like numeralsrefer to similar parts in the various views.

In FIG. 1, I have shown a carburetor body 10 having an air horn 11, achoke butterfly 5, a choke control rod 6, a butterfly control shaft 8for a throttle butterfly 7. Float 15 is pivoted on pin 16. Bell crank15a is secured to float 15 and abuts against needle valve 17 which maybe hexagon to pass fuel from seat 18 to the float bowl. Fuel line 19 issecured to the carburetor by nut 20. Fuel is fed to the idle needle 3 bypassage 4, 4c, 4a and 4b to the lower portion of the bowl below float15. Main jet fuel flows through orifice 12a, passage 12b, and ports inmain jet venturi 12. The flow is controlled by screw 13 having a needlevalve at its inner end 13a adapted to control the main jet fuel. At thebottom of the float bowl is a fitting 47 connected to the float bowl bya large opening. Fitting 47 is secured to pipe 46 by nut 47a. Tube 46 islarge enough to carry the capacity of the float bowl in less than twoseconds under normal operations. Tube 46 is connected to fitting 44 bynut 45. Fitting 44 is secured to diaphragm body 40a by hollow bolt 43which will also pass the float bowl capacity in under two sec-.

onds. Diaphragm housing 40 and 40a are crimped toget-her over the outerdiameter or diaphragm 49. Diaphragm 49 is secured to center portion 51in a suitable manner, including washers 52 and 52a spread out over aportion of the diameter of diaphragm 49. A guide for center portion 51is provided by the tubular extension 51a. Guide bolt 41 is threaded andengages the threaded portion of but; 40b of diaphragm body 40. Theadjustment of bolt 41 will vary the possible stroke of diaphragm 49 andcenter 51 and can be changed--then locked and sealed by nut 42. Controlof the suction to operate diaphragm 49 to suck out the fuel 9 from floatbowl of carburetor 10 is by line 39 which connects to the engine intakemanifold or to an engine partial vacuum pump or other suitable sourcesof vacuum. A check valve or flapper valve 38 in fitting 37, allowsabuild up of engine vacuum in accumulator 36 between engine throttlechanges and accumulates the higher vacuum of various driving cyclesoperated by the vehicle driver. Pipe or tube 35 is connected to theaccumulator 36. The flow through tube 35a and tube 35 is controlled byflow control screw 121 and two bleeds. Tube 109 has an opening that iscovered by soft pad 57 attached to control arm 56 for throttle shaft 8so that the bleed opening of the tube 109 is closed when throttlebutterfly is closed. Bleed tube 108 is closed by pad 107 when thegovernor 102 is driven above a speed such as 1000 r.p.m. of the motor orsuch other speed that return of the fuel to the carburetor bowl by thepower from spring 55'will be soon enough so that the engine will notstall and provide good driva-bility.

As the throttle butterfly is opened transfer port 2 delivers fuel andair from the idle fuel bleed 122 and the idle fuel passage 4b, 4a, 4c,and 4 to idle adjustment screw 3 and idle orifice 1.

An alternate control of engine suction is shown in FIG. 2 wherein theengine suction is connected to line 39. To operate the structure of FIG.1, or FIGS. 3 and 4, to be described, a check valve 38 sustains a higherthan average engine suction in accumulator 36. A spool valve 112 withreduced diameter portion 113 is in line with the opening in tube 35 forcontrol of the vacuum in the accumulator 36 by tube sections 35b and 350to the pipe 34 of said figures to operate suck out diaphragm 49 againstthe force of return spring 55 to suck the fuel 9 out of the bowl offloat 15. When the solenoid 110 is deenergized the spool valve 112 israised by solenoid spring 120 so that the reduced portion 113 is abovethe opening in tube 35, then air bleeds to the opening 35 from port 114by this raising the end of spool valve 112 as shown in dotted lines,FIG. 2. In this raised position of spool valve 112 the suction is cutoff from below diaphragm 49 and air is admitted through port 114 belowthe end of valve 112, through pipe 35a, 35, 34 to the under side ofdiaphragm 49 to allow the force of spring 55 to push diaphragm 49 to theposition shown in FIG. 1 where the fuel 9 is returned to the bowl offloat 15.

Solenoid 110 when energized holds the valve 112 in the full lineposition shown in FIG. 2. which supplies suction to line 35 which inturn lowers diaphragm 49 in FIG. 1 or raises cups 89 and 90 of FIG. 3tothe position shown in FIG. 4 to suck the fuel 9 from the carburetorbowl and shut off fuel flow to thecarburetor. When solenoid 110 isdeenergized by the opening of the governor and the throttle switches,armature 121 on the valve stem 112 moves up by spring 120 toallow bleedair to enter through port 114 to return fuel to the float bowl withdiaphragm 49 in the position shown in FIG. 1. Stop plate 123 ispreferably non-magnetic such as fibre, plastic, brass, etc. and spring120 bears against it to raise valve stem 112 so that the line from 35bto 350 is closed and 35 is open to the atmosphere, so that spring 55 anddiaphragm 49 return the fuel to the carburetor bowl in FIG. 1. In FIGS.3 and 4, spring 125 forces cup 90 down to return the fuel to thecarburetor bowl, as in FIG. 3. The solenoid 110 is connected to thevehicle battery in series with the ignition switch so that no drain canexist on the battery from this solenoid circuit when the ignition isoff. The circuit includes two switches in seriesone connected to a speedsensitive device or gov-.

ernor that closes the switch above a predetermined speed of around 30miles per hour. The throttle switch is closed when the foot throttle(not shown) is in the throttle closed or engine idle position. Thisresults in closing the circuit to the solenoid when the foot throttle isin the closed or idle position and the car is traveling above 30 milesper hour, as in a high speed deceleration or deceleration above 30 mph.This is the condition'shown in FIG. 2 and FIG. 4. Fuel is returned tothe carburetor when the speed gets below 30 mph. with the foot throttleclosed so that the engine will not stall because the governor opens thegovernor switch below 30 mph. and the throttle switch is closed and thesolenoid is not energized so that valve stem 112 is raised andatmospheric pressure returned to line 35 and fuel is returned to thecarburetor bowl. In the operation of the solenoid 110 as described valve112 is raised when the solenoid is not energized when either thegovernor switch or throttle switch is open. If, when decelerating above30 mph. with both switches closed the solenoid energized valve stem 112is moved down, as shown in FIG. 2, fuel is drawn out of the bowl. Ifduring such .a deceleration the trrottle is opened, the throttle switchwill open, deenergizing the solenoid, valve 112 will raise admitting theatmosphere to line 35 returning fuel to the bowl for part open throttleor full open throttle power.

Returning to FIG. 1, I have shown a small diaphragm 27 connected to rod25 and to rod 21 which has a turned or T end 21a which holds up float 15when the fuel is drawn from the float bowl by a partial vacuum in lines35-34-31 and below diaphragm 49. This same engine vacuum operates abovediaphragm 27 enclosed in diaphragm body 29. Spring 28 urges diaphragm 27downward to free float 15 to allow fuel to enter through needle valve 17to maintain the fuel at the desired level in bowl of float 15 after thefuel has been returned to the float bowl and the suction below thediaphragm 49 and above diaphragm 27 returned to, atmospheric pressure.This is accomplished by the device shown in FIG. 2 by the raising ofvalve 112 to allow tube 35a to connect to air port 114 if the controlshown in FIG. 2 is used. If the control shown in FIG. 1 is used wheneverthe bleed tube 109 or 108 is opened by throttle control 56 or governor102 diaphragms 49 and 27 will assume the position shown in FIG. 1.Throttle operated valve 57' and governor operated valve 107 are shownclosed as just before suction has moved diaphragm 49 or diaphragm 27against springs 55 and 28 respectively as when starting to decelerateabove 30 mph. with a closed foot throttle. Deflector 124 prevents thesudden rush of fuel back to the bowl of float 15 from butting the float15 and/or float bowl breather tube 125.

In FIGS. 3 and 4 I have shown a carburetor body 50, a bowl for float152. Float 152 rises and falls on fuel 9 and is pivoted by pin 151 .andhas an arm extension 152b. Extension 1521) presses on hexagonal needlevalve 153 to close on seat 154 to stop fuel from entering through fuelpipe 19 which leads to a gravity fuel tank or fuel pump not shown. Themain jet and idle jet intake is from well below the top of the fuel 9 inthe bowl of float 152, such as is shown in FIG. 1. Other desired typesof main and idle fuel feed systems from the float bowl can be employed.

Outlet 150f at the low point in the bottom of the bowl for float 152 isconnected by fitting 159 to the bottom of cylinder 61. Cylinder 61 has astep against which diaphragm 63 is held securely by spacer sleeve 62which forms the cylinder wall for upper piston cup 83 which is vacuumactuated. The lower end of the cylinder 62 is vented to the atmosphereby port 61a extending through cylinder 61. Cup 83 may be made of leatheror other suitable material and is secured to piston rod by nut 81, upperwasher 82, and lower washer 84. Expander spring 84a is nested in arecess of lower washer 84 and presses against the lip of cup 83.Enlarged internally threaded portion a of lower piston rod 85 secureswasher 84 against cup 83, washer 82 and nut 81 to form a secure upperpiston assembly. Diaphragm 63 may have a seal such as O-ring 63a to sealrods 85. Lower piston cups 89 and are secured to rods 85 by washers. 88and 92 respectively. Expander ring or spring 87 expands the lip of cup89 and spring 91 expands the lip of cup 90. Bolt 160 secures fitting 159to the lower head of cylinder 61. Holes around the bolt 160 permit rapidflow of fuel from the bowl of float 152 to cylinder 61 below cup 90 whencup 89 is drawn upward by partial vacuum above cup 83 in spacer sleeve62. Bolt 158 engages spider 156 to hold fitting 159 secured to thebottom of the bowl of float 152. Holes 157 in spider 156 direct the flowof fuel returned to the bowl of float 152 outwardly rather thanvertically so as not to reach bowl vent 50e which may be to theatmosphere or to the carburetor horn, such as vent 125 of FIG. 1.

Rod 93 has lower collar 94 secured by a pin and upper collar 95 securedby a pin. Spring 96 urges rod 93 upward. Arm 65 is secured to piston rod80 by a pin at hub-65a. End 65b abuts against rod 93 to depress spring96 to allow float 152 to follow the level of fuel 9 down to where fuelwill be admitted, as shown in FIG. 3, past needle valve 153 to fill thebowl of float 152 to the proper level.

When cup 83 raises cup 89 as on decelerations by suitable controls, asshown in FIGS. 1 and 2, the fuel is rapidly withdrawn from the bowl offloat 152, as shown in FIG. 4. As soon as end 65b of arm 65 moves upwardto start the evacuation of the fuel from the bowl of float 152, spring96 raises rod 93 and flange 94 raises float 152, so that extension 152!)forces needle valve 153 to close on seat 154 to stop the flow of fuelfrom pipe 19 through passage 154 .so that no fuel can flow from pipe 19to the bowl of float 152 while the end 65b of arm 65 is above and out ofcontact with rod 93 which exists during the evacuation and return offuel 9 from the bowl of float 152. Piston rods 80 and 85 are returned tothe position shown in FIG. 3 from that shown in FIG. 4 by spring 125which is attached to end 65c of arm 65 and at its lower end to the endof extension 61b, which arm is attached to the head and side of cylinder61. Guide pin 64 prevents arm 65 from rotating by passing through a holetherein.

Cup 83 pulls piston rod 80, piston rod 85, and cup 89 upward whenpartial vacuum from the engine manifold is admitted through tube 35 andpassage 71. Control of the vacuum through tube 35 could be by controls,such as are shown in FIGS. 1 and 2, or by such other suitable controls,one of which is shown in Mallory, US. Patent 2,395,748, dated February26, 1946. Solenoid 110 of FIG. 2 may be controlled by suitable switchessuch as are shown in SAE Report No. 170, see FIG. 26. In order to takecare of the breathing above cup 89 and below diaphragm 63, I haveprovided a passage 100, 99 and 101 from the upper end of cylinder 61below diaphragm 63 so that air (and a very small portion of fuel whichmight seep past cups 90 and 89) passes freely back into the top of thebowl of float 152.

The form of the invention shown in FIG. 5 is similar to that of FIG. 1and the same numerals are used to designate the same parts. However, inFIG. 5 an adjustable, threaded type needle valve T is provided inconduit 31 to throttle the flow of air to the motor means M and a checkvalve CV is provided to by-pass the needle valve T to allow a fastwithdrawal of air from the motor and to prevent return of air thereto.

' In operation, a vacuum is applied simultaneously to the motor M andthe vacuum motor VM of the pump P to simultaneously withdraw the fuel 9from bowl of float 15 and to force and retain valve 17 on its seat 18 toprevent flow of fuel into the bowl. When the vacuum is broken however byadmitting atmospheric air, spring 55 and diaphragm 4 9 will operatetoqu-ickly return the fuel to the bowl. Due to the adjustable throttlevalve T the breaking of the vacuum in the motor M is delayed until thefuel has been returned to the desired level in the bowl. After thisdelay period the spring 28 urges diaphragm 27 downwardly and with it theyoke 21 is lowered to remove the support 21a from the under side of thefloat 15 and lever 15a and thus disconnect the motor M from the normalvalve operating mechanism 15, 15a, and thus return control of the valve17 to the float 15.

g The form of the invention illustrated in FIG. 6 is similar to that ofFIG. 5 and the same numerals are therefore used to designate the sameparts. However, in this modified form of the invention the bottom of thebowl is formed by a bellows B which is an expansible chamber. In thismanner the bellows construction with the pivoted lever and motor takethe place of the VM and P of FIG. 5. The volume of the chamber in theexpanded condition of the bellows illustrated in full lines in thedrawing is equal at least to the volume of fuel to be drained or loweredfrom the bowl, the same as in the case of the pump P, in FIGS. 1 and 5.The bellows is therefore expanded by a vacuum motor VM in which a piston49a having a rod 4% is suitably connected to the bottom of the bellowsby a lever L and link L pivoted at an intermediate point on a bracket Nfixed to the bowl and is collapsed by a return spring S fixed to thebowl and lever L. In operation a partial vacuum is appliedsimultaneously through pipe 34 to the motor VM at the upper side of thepiston 49a. The piston of the motor VM operates to expand the bellows towithdraw the fuel from the bowl and to simultaneously raise the rod 25to thereby rotate bellcrank 15a to press valve 17 onto its seat 18 toprevent flow of fuel into the bowl. When the vacuum is broken byadmitting atmospheric air the bellows is collapsed by the spring S toreturn the fuel to the original level in the bowl, as shown in thedotted line position. Due to the adjustable throttle valve T thebreaking of the vacuum in the motor VM is delayed until the fuel hasbeen returned to the original level. After this delay period the support21a is removed from supporting the bellcrank 15a as stated before, todisconnect the motor from the valve operating mechanism 15, 15a toreturn control of the valve 17 to the float, also shown in dotted linesin FIG. 6.

I have illustrated my invention in these various forms; however, manyother variations may be possible within the scope of this invention.

To those skilled in the art to which this invention relates many changesin construction and widely differing embodiments and applications of theinvention will suggest themselves without departing from the spirit andscope of the invention. The disclosures and description herein arepurely illustrative and are not intended to be in any sense limiting.

I claim:

1. A carburetor comprising a bowl, valve means for controlling the flowof fuel into the bowl to maintain a predetermined level of fuel therein,means for drawing the fuel from the bowl, means for closing the valvemeans for preventing flow of fuel into the bowl when the fuel is drainedtherefrom, means for returning the fuel to the bowl, and means foropening the valve means after the fuel has returned to the bowl.

2. A device as in claim 1, wherein the means for draining the fuel fromthe bowl comprises a pump, a source of vacuum, and means for connectingthe pump to said source.

3. A device as in claim 1, wherein the means for closing the valve meanscomprises a motor, a source of vacuum, and means for connecting themotor to said source.

4. A carburetor comprising a bowl, valve means for controlling the flowof fuel into the bowl to maintain a predetermined level of fuel therein,pump means for withdrawing the fuel from the bowl, a motor connected tothe valve means for closing the valve means to prevent flow of fuel intothe bowl when the fuel is drained therefrom, a common source of vacuumfor said pump and motor, means for simultaneously connecting the pumpand motor to said source to simultaneously withdrawing the bowl andclose the valve means, and means for returning the fuel to the bowl anddisconnecting the valve means from the motor after the fuel has returnedto the bowl.

5. A carburetor comprising a bowl, valve means for controlling the flowof fuel into the bowl to maintain a predetermined level of fuel.therein, pump means for draining the fuel from the bowl, a motorconnected to the valve means for closing the valve means to prevent flowof fuel into the bowl when the fuel is drained therefrom a common sourceof vacuum for said pump and motor, means including conduits forsimultaneously connecting the pump and motor to said source tosimultaneously drain the bowl and close the valve means, means forbreaking the vacuum to the pump and to pump the drained fuel back intothe bowl, and means for breaking the vacuum to the motor a predeterminedtime after the vacuum to the pump is broken and to disconnect the motorfrom the valve.

6. A device as in claim wherein the means for breaking the vacuum to themotor a predetermined time after the vacuum to the pump is brokencomprises an adjustable throttle valve in the conduit to the pump.

7. A device as in claim 6 wherein the means for simultaneouslyconnecting the pump and motor to the vacuum source comprises a checkvalve in the conduit to the pump by-passing the throttle valve to allowair flow away from the motor and prevent air flow to the motor.

8. A carburetor comprising a bowl, valve means for controlling the flowof fuel into the bowl to maintain a predetermined level of fuel therein,means for draining the fuel from the bowl and returning the drained fuelthereto comprising a pump and a conduit connecting the pump and bowl,means for closing the valve means for preventing flow of fuel into thebowl when the fuel is drained therefrom, and means for opening the valvemeans after the fuel has returned to the bowl..

9. A carburetor comprising a bowl, valve means for controlling the flowof fuel into the bowl to maintain a predetermined level of fuel therein,an expansible chamber connected to the bottom of the bowl and having avolume in the expanded condition at least equal to the volume of fuel tobe drained from the bowl, pump means for expanding and contracting thechamber to withdraw fuel from the bowl and return the withdrawn fuel tothe bowl, means for closing the valve means for preventing flow of fuelinto the bowl when the fuel is drained therefrom, and means for openingthe valve means after the fuel has returned to the bowl.

10. A device as in claim 9 wherein the expansible chamber is a bellowssecured to the bowl.

11. A carburetor comprising a source of vacuum and a fuel bowl, valvemeans for controlling the flow of fuel into the bowl to maintain apredetermined level of fuel therein, means for lowering andreestablishing said predetermined level of fuel in said bowl, separatemeans for controlling the flow of fuel to said bowl during the loweringof said predetermined level of fuel in said bowl, and said bowl havingmeans responsive to the source of vacuum in said carburetor tosimultaneously control the level of said predetermined level of fuel insaid bowl and the supply of fuel to said bowl.

12. The structure of claim 11 wherein said means for lowering andreestablishing said predetermined level of fuel in said bowl comprises avacuum pump.

13. The structure of claim 11 wherein said means for lowering andreestablishing said predetermined level of fuel in said bowl comprises abellows.

14. A carburetor for a vehicle engine having a float bowl, a float, fuelon Which said float usually floats, a needle valve controlled by saidfloat, fuel jets, said fuel jets connected to said float bowl below thetop of the fuel in said bowl when said needle valve is closed by saidfloat, a second chamber capable of storing the fuel from said floatbowl, said second chamber being of variable volume, a fuel passageconnecting said second chamber to said float bowl, said fuel passagebeing open to rapid fuel passage in either direction between said bowland said second chamber, power means for expanding the volume of saidsecond chamber to rapidly suck all the fuel from said float bowl, andpower means for simultaneously closing said needle valve during theperiod said fuel has been sucked from said float bowl to said secondchamber, other power means for returning said fuel rapidly from saidsecond chamber to said float bowl.

15. A structure as described in claim 14, in which said second chamberis below said float bowl, and includes a movable diaphragm powercontrolled to remove the fuel from said float bowl during high speeddecelerations whether the brakes are applied or not.

16. A structure as described in claim 14, in which said power meansincludes an engine intake manifold suction powered device, to move saidfuel in one direction between said float bowl and said second chamberand spring means to move said fuel in the reverse direction between saidfloat bowl and said second chamber.

17. A structure as described in claim 14, in which said second chamberhas a diaphragm for part of its wall surface, said diaphragm being movedto vary the volume of said chamber and control the transfer of fuel fromsaid float bowl to or from said second chamber, said diaphragm actuatedin one direction by engine powered suction and in the other direction byspring means.

18. A carburetor having a throttle, a throttle control, a float, a floatbowl, an engine for a vehicle connected to said carburetor, a secondchamber connected by a conduit for fluid flow to said float bowl, powermeans for rapidly drawing fuel through said conduit from said float bowlto said second chamber and power means for rapidly returning said fuelthrough said conduit from said second chamber to said float bowl, agovernor driven by said engine, said governor in series with othercontrols constrolling said power means.

19. A structure as described in claim 18, in which the power means tomove the fuel from said second chamber to said float bowl includes acoil spring.

20. A carburetor having a throttle, a throttle control, a float, a floatbowl, an engine for a vehicle connected to said carburetor, a secondchamber connected for fluid flow to said float bowl, power means forrapidly drawing fuel from said float bowl to said second chamber andpower means for rapidly returning said fuel ,from said second chamber tosaid engine, a governor driven by said engine, a carburetor throttlecontrol, said power means including engine powered suction, a conduitconnecting said suction from said engine to said power means, saidconduit including a valve means controlled by said throttle control andgovernor.

21. A carburetor having a throttle, a throttle control, a float, a floatbowl, an engine for a vehicle connected to said carburetor, a secondchamber connected for fluid flow to said float bowl, power means forrapidly drawing fuel from said float bowl to said second chamber andpower means for rapidly returning said fuel from said second chamber tosaid engine, said power means including two switches, one operated bysaid governor, the other operated by said throttle control so that saidfuel is withdrawn from said float bowl at high speed deceleration.

22. A structure as defined in claim 21 in which said fuel is returned tosaid float bowl when said throttle is opened during a high speeddeceleration.

23. A carburetor having a throttle, a throttle control, a float, a floatbowl, an engine for vehicle connected to said carburetor, a secondchamber connected for fluid flow to said float bowl, power means forrapidly drawing fuel from said float bowl to said second chamber andpower means for rapidly returning said fuel from said second chamber tosaid float bowl, a governor driven by said engine, said governor inseries with other controls controlling said power means, a throttlecontrol for said carburetor, the power means being automaticallyactuated to withdraw the fuel from said bowl when said vehicle isoperating at a high speed deceleration, said power means controlled by afunction of engine speed and by the position of said throttle control.

24. A structure as described in claim 23, in which said second chamberconsists of a cylinder and piston, the motion of said piston controllingthe passage of fuel from said second chamber to said float bowl and viceversa.

25. A structure as described in claim 24, in which said carburetor has aneedle valve controlled by said float, a fuel pressure supply to saidcarburetor, a mechanical connection between said piston and said needlevalve to hold said needle valve closed when said piston is in thepositions to withdraw fuel from said float bowl to prevent fuel fromsaid fuel presure supply from entering said float bowl while said pistonis in such a position to withdraw fuel from the float bowl.

26. A carburetor having a throttle, a throttle control, a float, a floatbowl, an engine for a vehicle connected to said carburetor, a secondchamber connected for fluid flow to said float bowl, power means forrapidly drawing fuel from said float bowl to said second chamber andpower means for rapidly returning said fuel from said second chamber tosaid float bowl, a governor driven by said engine, said governor inseries with other controls controlling said power means, said carburetorhaving main fuel jets and idle fuel jets, fuel paths leading from belowthe normal fuel level in said float bowl to said main and idle jets,when the fuel in said bowl is withdrawn to said second chamber the fuellevel in said bowl being substantially below the intake to said fuelpaths in said float bowl.

References Cited by the Examiner UNITED STATES PATENTS MARK NEWMAN,Primary Examiner.

I LAURENCE M. GOODRIDGE, Examiner.

1. A CARBURETOR COMPRISING A BOWL, VALVE MEANS FOR CONTROLLING THE FLOWOF FUEL INTO THE BOWL TO MAINTAIN A PREDETERMINED LEVEL OF FUEL THERIN,MEANS FOR DRAWING THE FUEL FROM THE BOWL, MEANS FOR CLOSING THE VALVEMEANS FOR PREVENTING FLOW OF FUEL INTO THE BOWL WHEN THE FUEL IS DRAINEDTHEREFROM, MEANS FOR RETURNING THE FUEL TO THE BOWL, AND MEANS FOROPENING THE VALVE MEANS AFTER THE FUEL HAS RETURNED TO THE BOWL.